a debtor who flees to avoid paying of an impermanent nature; "the symphony is no fly-by-night venture"
disapproval A fly-by-night businessman is someone who wants to make money very quickly, without caring about the quality or honesty of the service they offer. fly-by-night operators who fail to complete jobs. = cowboy. a fly-by-night company or businessman is one that you cannot trust because they have only been in business for a short time and are only interested in making quick profits